Hawk Performance HP+ (High Performance Plus) Brake Pad Set. Part Number: HB550N.634. Position: Front. This kit includes a set of 4 disc brake pads. The HP+ compound is designed for Autocross and Track Day applications, offering a high friction coefficient and extreme fade resistance. Features: Extremely high friction output, fade resistant, consistent torque, and ideal for aggressive street/track use. Technical parameters: Thickness: 0.634in / 16mm.